How to make my mom's 1yr old chihuahua stop biting me when I try to play with her? She bites my hands alot so i dont take of leash anymore?

Training/correction of the family dog is everyones responsibility. There is no shame in seeking professional help for the entire family, on how to train a dog properly. Preferably before the dog injures someone/something, is removed at the families expense, family is sued and the dog is euthanized.

Bop it across the nose with 2 fingers and say no until it dont do it no more simply.. and directly cease playing and ignore it for a while. it will soon learn

Talk to your MOTHER about the problem. Tell her the dog IS biting you, any time you TRY to play with her. (Perhaps - you are not playing correctly with the dog). But also INDICATE, this is WHY you do not want to take the dog for a walk, any more. See if she "thinks" it is something just YOU do incorrectly, in approaching or handling the dog, or if she admits the dog bites everybody - or a lot of people.

I FEEL the dog ought NOT to be biting (AT ALL) unless it is being hurt or unless it feels TRULY threatened (which I doubt is occurring). The biting may indicate the dog lacks bite inhibition or have NEVER PROPERLY BEEN TAUGHT.... NOT TO BITE PEOPLE. This tends to be MORE of a problem in Chihuahua, than other breeds. They are a nippy breed (by nature) and as a smaller breed are often NOT corrected, for BAD BEHAVIOR, that would be corrected in a larger breed.

IMO, your mother needs to hire a dog trainer to come to the home, to HELP with this problem. If your dog bites a guest or a delivery person, YOUR mother can be SUED and the dog can be removed from the home & held at Animal Control.